Kinglee

Hi any help appreciated on this one I have the part number for my interface control unit 4L0 910 729 TX with a superseded part no of 4L1 910 732 HX, I understand the x is for exchange unit. The problem is I can not find those exact part numbers I can find is 4F0 910 732 H will this be compatable and where is this unit located I recently fixed the fron sunroof leak and an led to beleive it's located in the front right. Any help is appreciated on this one